Dishwasher Not Draining
Standing water in the bottom of the tub at the end of a cycle? Bosch says nearly half of all drainage problems trace back to a clogged filter — which most people never know exists. This guide shows you where it is and how to clean it.
Estimated time to work through: ~10 minutes
NEVER pour chemical drain cleaner into a dishwasher.
Drano, Liquid-Plumr, or any chemical drain cleaner is unsafe in a dishwasher. Manufacturer guidance and home services sources are unanimous: chemical drain cleaners corrode rubber seals, plastic parts, hoses, and pumps. They leave residue that burns skin and contaminates dishes. They can produce toxic fumes when mixed with detergent residue. If a chemical drain cleaner has been used: do NOT bail with bare hands. Submit a maintenance request immediately. Ventilate the kitchen.
Kill power at the breaker before reaching deep into the tub.
If the unit has been throwing error codes, flashing lights, or anything electrical seems off — turn off the dishwasher at the breaker before any troubleshooting. Standing water plus electrical components is a shock hazard.
Broken glass in the filter? Use tongs — never bare fingers.
Glass shards in the filter sump are common (glasses break, get pushed through the silverware basket). Use tongs, needle-nose pliers, or a paper towel as a barrier when clearing the filter area.
The Drain Path Is Short. Three Places It Can Clog.
Water at the bottom of your dishwasher leaves through a short drain path: down through a filter, into a pump, out through a drain hose, and into either the garbage disposal or the kitchen sink drain. Anywhere along that path, a clog stops the water. The filter is by far the most common point — most owners never clean it. Next most common: the disposal didn't get run first (so the dishwasher tries to drain into a full disposal). Third: the air gap on the countertop (if your unit has one). Beyond those three is maintenance territory.
What you can safely check
- Whether the garbage disposal needs to run first
- The dishwasher filter
- The air gap on the counter (if present)
- A visibly kinked drain hose behind the unit
- Whether the disposal knockout plug was removed on a new install
What requires a maintenance request
- Replacing or disconnecting the drain hose
- Anything inside the pump or impeller
- Removing the pump cover
- Replacing the float switch
- Electrical work on the unit
- Leaks under the unit
The 6-Step Troubleshooting Flow
- 1
Run the garbage disposal for 30 seconds with cold water
Many dishwashers share their drain line with the garbage disposal. A disposal full of food blocks the dishwasher's drain. Run cold water + the disposal for 30 seconds, then try the dishwasher's drain cycle. Surprisingly common quick fix.
- 2
Run the dishwasher's Drain-Only or Cancel/Drain function
Most dishwashers have a Cancel function (hold the button 3 seconds on most Whirlpool/KitchenAid models). This drains the tub. Sometimes a single drain cycle clears whatever stalled the previous cycle.
- 3
If water is still standing, bail it out
Wear dish gloves. Use a cup and sponge to move water from the tub into a bucket. Skip this step if anyone has used chemical drain cleaner — see the safety section above.
- 4
Clean the filter
This is the big one. See the featured how-to below — jump to the filter clean.
- 5
Clean the air gap (if your unit has one)
Look at your sink area. If you have a small chrome or plastic cylinder mounted on the counter behind the faucet, that's the air gap. Twist off the cap and the inner cover. Use a bottle brush to scrape out food debris. Rinse and reinstall. Run hot water through.
- 6
Check the drain hose visually
Open the cabinet next to the dishwasher (where the hose runs). Is the hose visibly kinked, crushed, or pinched? If yes, straighten it. If straightening doesn't help, or you can't access it safely — submit a request.
How to Clean the Dishwasher Filter
Almost every modern dishwasher has a filter at the bottom of the tub. It catches food before it goes to the pump. It needs to be cleaned every 3–6 months (more often in hard-water areas). Most owners have never touched it. Bosch says cleaning the filter resolves nearly half of all drainage complaints. Here's how.
- 1
Pull the lower dish rack out so you can see the floor of the tub.
- 2
Look at the bottom center. You'll see a circular cylindrical filter (the upper filter) and a flat mesh disc around it (the lower filter).
- 3
Twist the upper cylindrical filter counter-clockwise about a quarter turn and lift it out.
- 4
Lift the lower flat filter straight up to remove it.
- 5
Rinse both under warm tap water. Use an old soft toothbrush to scrub stuck-on food. Never use a wire brush — it damages the mesh.
- 6
Inspect for hard items — broken glass, fruit pits, twist ties. Remove with tongs.
- 7
Reinstall: flat filter first, then the cylindrical filter on top. Twist clockwise until it locks (you'll feel and hear it click).
- 8
Run a drain cycle to confirm the fix.
Different models look slightly different. If you can't tell which way your filter twists, check the dishwasher's user manual (often in a sleeve on the inside of the door panel) or photograph yours and submit with a maintenance question — we'll guide you remotely.
Stop And Submit A Request If…
Submit a request when any of these apply:
- You worked through the 6 steps and water is still standing
- You see water leaking from under the dishwasher
- Loud humming or grinding from the pump
- Error codes that don't clear after cancel/drain
- You used chemical drain cleaner and need it neutralized
- Drain hose is kinked behind the unit and you can't safely reach it
- Brand-new dishwasher that has never drained (likely the disposal knockout plug — we'll come remove it)
Hard water = monthly filter cleaning
In hard-water areas (most of Central Florida), mineral scale builds up in the filter mesh and dishwasher pump faster than the national average. The manufacturer's 3–6 month cadence is optimistic here — cleaning the filter monthly is more realistic. Set a phone reminder for the first of the month.
Hurricane prep
If a power outage is expected mid-cycle, run a Drain Only cycle to empty the tub before the storm. Standing water in a sealed dishwasher tub for days in Florida humidity breeds mosquitoes, mold, and odor.
Five Habits That Prevent Drain Problems
- 1
Scrape plates before loading. Don't pre-rinse (modern detergents need food residue to grip onto) but do remove chunks.
- 2
Clean the filter monthly in Florida (every 3–6 months elsewhere).
- 3
Run the garbage disposal before starting the dishwasher.
- 4
Run a hot wash with dishwasher cleaner or 1 cup white vinegar in an empty unit monthly. Keeps the pump and lines clean.
- 5
Don't overload. Water needs to circulate to reach the filter and rinse aid jets.
More From The Library
Browse all troubleshooting guides
Self-help guides for tenants, by Sea Dog.
What This Guide Is Built On
Sea Dog's guides are grounded in authoritative manufacturer and trade sources. For dishwasher drainage we draw on Bosch, KitchenAid, Whirlpool, Maytag, GE Appliances, Family Handyman, and Repair Clinic.
This guide is educational and does not modify your lease. It is not professional appliance-repair advice. If a step does not resolve your issue, or if you have any safety concern, stop and submit a maintenance request through the tenant portal or contact Sea Dog at the tenant maintenance line. In any conflict between this guide and your signed lease or applicable Florida law (Florida Statutes Chapter 83), your lease and Florida law control.